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A static energy meter differs from the induction type in that it has

  • A.a disc of steel rather than aluminium
  • B.no pressure coil
  • C.a mechanical register in place of the electronic display used previously
  • D.no moving parts in its measuring element

Answer: D

Voltage and current are sampled, multiplied and integrated electronically, and the result is shown on a display and often transmitted as well. The absence of bearings removes friction, creeping and wear at a stroke, which is why such meters have displaced the induction type.

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